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(3) Common Location

National Electrical Code 2020 of Illinois > 2 Wiring and Protection > 250 Grounding and Bonding > 250.64 Grounding Electrode Conductor Installation > (D) Building or Structure With Multiple Disconnecting Means in Separate Enclosures > (3) Common Location
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A grounding electrode conductor shall be connected in a wireway or other accessible enclosure on the supply side of the disconnecting means to one or more of the following, as applicable:
  1. Grounded service conductor(s)
  2. Equipment grounding conductor installed with the feeder
  3. Supply-side bonding jumper
The connection shall be made with exothermic welding or a connector listed as grounding and bonding equipment. The grounding electrode conductor shall be sized in accordance with 250.66 based on the service-entrance or feeder conductor(s) at the common location where the connection is made.

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